A member asked:

What functional orthodontics can address an overjet (and overbite) caused by a protruded upper jaw?

8 doctors weighed in across 7 answers

Diagnosis > options: Protruded upper jaws are unusual, although they exist. More often the lower jaw is back, making the upper jaw seem protruded. For protrusion, upper teeth (jaw) can be moved back with quite a few appliances; pendex, cd distalizer, headgear, etc. Most often however, it is usually the lower jaw that needs to come forward. A herbst, mara, etc. Can work. If the mandible is too small > surg/distraction.

Answered 12/10/2013

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Many appliances: Many overbites (overjets to orthodontists) are dealt with by a wide variety of functional appliances. I know of no literature that stands the scientific test that shows that they"grow" the lower jaw, they all use the muscle tension of a protruded lower jaw to restrain growth of the upper jaw, as well as lean the lower front teeth outward. Genetics defines the size of the lower jaw.

Answered 12/10/2013

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Age dependent result: Functional orthodontic appliances redirect facial growth parameters to more a favorable result. They depend upon growth, best applied before age 11 in most children. We usually diagnose a retrusive lower jaw as opposed to a protrusive upper jaw, especially in caucasions. Headgear is the traditional appliance that most people will recognize. A herbst appliance is a great option.

Answered 4/3/2013

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Dr. Kenneth Zipkin answered

Specializes in Dentistry

Probably none: If the upper is protruded there is a skeletal jaw mismatch. Therefor , all the upper front teeth need backward movement. This is usually accomplished with extraction of teeth in the upper jaw and possibly in the lower as well, with full orthodontic therapy..

Answered 11/27/2017

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Misnomer: Most "functional" devices are hardly functional and they do not "grow" lower jaws despite wishful thinking. The effects are primarily mid-face and the interruption of dentoalveolar compensation is the most prominent part of the correction - no matter the device used or jaw addressed. The term "functional" is fading as the actual mechanisms are understood and removable devices lost popularity.

Answered 4/3/2013

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For you?: Functional orthodontics is most effective on growing children.

Answered 4/25/2015

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Unusual: Most of the time it's lower jaw too far back, rather than upper jaw too far forward. If upper jaw is determined by skull x-ray and measurements to be too far forward, for an adult braces + jaw surgery may be required. Functional appliances are only modestly effective for growing children and are totally ineffective for non-growing adults. See an orthodontic specialist for evaluation and rx.

Answered 9/12/2013

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